The latest firmware for the Mini is also throwing error 1052. As with 1039 there is no documentation on the Makerbot website.

Is it possible that the latest firmware for the Mini forces one to have a raft? If so, that is a non-backward compatible change. The software engineer or project manager who thinks that silently taking away a critical feature such as this, a feature that users (for example, this one) have been using successfully for quite sometime is acceptable is just plain wrong.

Cheers, Scott